STAC3 and Native American myopathy: <h4>Background</h4>Congenital myopathy-13 (CMYP13), also known as Bailey-Bloch congenital myopathy and Native American myopathy (NAM), is a condition caused by biallelic missense pathogenic variants in <i>STAC3</i>, which encodes an important protein necessary for the excitation-relaxation coupling machinery in the muscle.